Electric fuse.



M. G. WARREN.

ELECTRIC FUSE.

APPLICATION FILED JULY 31,1912.

Patented Mar. 25, 1913.

2 BHEETS SHEET 1.

M. G. WARREN.

5x1201 310 FUSE.

v AZPLIGATION FILED JULY 31, 1912. l @556 8613, Patented Mar. 25, 1913.

2 SHEETSSHEET 2,

PEA?

gnome a mun m n t m m if! JL Us: ills/auc- ELECTEIC FUSE.

Specification of Letters Patent. L

Anplieation filed July 31, 1912.

atcntcd Mar. 25, 1913.

Serial nu 712,61

an electric -i"usc, means for automatically breaking; the arc which is established at the time the fuse is destroyed.

In the ordinary construction of 't'usc boxes, when the fuse is destroyed, an arc is liable to be established between the fuse supports and if the current is heavy this arc is liable to destroy the entire box.

The present invention therefore contcmplates the provision, in such a device of means arranged to move automatically to position between the fuse supports innuediatcly after the fuse is destroyed.

For a full understanding of the invention reference is to be had to the following description and accompanying drawing, in which:--

Figure l is a perspective view of the electric fuse and out out embodying the present invention. Fig. 2 is a vertical sectional view taken in a plane from front to rear'thcre,

through. Fi 3 is a horizontal section on the line 33 of Fig. 2. Fig. 4 is a vertical transverse section on the line 4- of Fig. 2. Fig. 5 is a perspective view, of the fuse su porting plu Zlorrespending and like parts are referred to in the following description and indicated in all the views of the drawing by the some reference characters.

In the drawing the device is illustrated as housed Within the casing the bottom of which is indicated by the numeral 1, the sides by the numeral 2 and the top by the numeral 3, the casing being provided at its front with a door This casing is formed in its bottom with an ope ing 5 and for a purpose to be presently explained.

The base of the device embodying the present invention is indicated at 6 and is of porcelain or other heat resisting insulating material, and this base is formed upon its under side witha boss Whichprojects into the opening Formed upon the upper side of the base 6 is an approx lately rectangular body 8 which is recessed in its iforward sideas at l. the rear wall of the rece s being in turn recessed as at 10. Sccurccl upon the said rear wall of the reccss 9 at opposite sides of the recess 10 are plates 11 which are so folded as to provide forwardly projecting tongues,- 12, and leading through openings 13, formed in the base (3 and body 8, are conductor wires ll. each of thcsewircs leading to one of the plates 11 and the said plates 11. constituting terminals which arc to be braced by the fuse plug. By referring to Figs. and t ot the drawings it will be observed that the side walls of the recess 5) are in turn recessed as at 15 and that it is at the inner ends oi those recesses 15 that the terminals 11 are located.

The fuse plug comprises a substantially U-shaped body 16 of porcelain, or other suitable insulating material and the fuse supports and contacts are arranged one upon each arm of the body 16. Each of the contacts or terminals of the plug is preferably formed from a strip of metal bent to form attaching portions 1? and bent between the said attaching portions to form spaced fingerslS which are slightly spaced at their, forward ends as indicated by the numeral 19. It will be observed that the fingers 13 lie one above another so that when the fuse plug is inserted into its socket. in the body 8, thc arms 16 of the plug will cuter the recesses 15 and the tongues 12 will be rc ccived between the fingers 18 of the respective fuse plug terminals and grip the ends of the fuse wires indicated at 23.

The device also includes in its structure a block 25 which is preferably of porcelain, and this block as illustrated inthe drawing is substantially, rectangular in form and fiat-sided and of a thicknesstoloosely fit between the walls of the recesses 9 and 10 in the manner illustrated in Figs. 3 and 4 of the drawing. A bar 26 also or insulating material is secured at its ends to the forward side of the body 0 and spans the forward end of the recess J, and this bar serves to,

prevent withdrawal ofthe'block 25 after it has been placed in position within the said from one of the terminals 11 across thc'fusc wire to the other terminal 11. In the nieantime the block been lifted by means and should the wife be' destroyed, r block will immediately fall by gravity to the position shown place,-

of a handle 27 uponits forward edge; and after the fuse plug has been inserted vintii the block is lowered until its, lower edge I rests upon the said fuse ,wire,2 0,

Should an overload pass through the wire the in dotted 111105; in. Figifiof the drawing, inwhich positionit will lie betweenthc terminals 11 ofthefuse plug socket, thereby destroying or preventingj'he formation of an arc betweenthese terminals which would be liable to occur were it not for the prot sion of this block. Having thus described the invention what is-claimed as newis:" p p 1. In a cutout of the classdescribed, a recessed support of insulating material, a fuse wire support removably arranged within the recess of the first mentioned support, a fuse wire carried by the fuse wire support, spaced contacts upon the first mentioned support,

contacts upon the fuse wire support electrically connected with the fuse wire. and arranged to engage with the first mentioned contacts when the fuse -wire support is in placewit-hin therecess in the first menen tioncd tioned supportyand a member arranged to automatically move. to position between the contacts of, the fuse wire support upon the destruction of the fuse Wire, the said member being normally restrained against such movement by the sa'id fuse wire. 4 1 y In a cut-out of the class described, a. recessed support of insulating material, a fuse wire support removably arranged within the recess of the first mentioned support, a fuse' wire carried by the fuse wire support, spaced contactsupon the first men: tioncd support, contactsupon the fuse wire glsuipporl electrically connected with the fuse arranged to engage with the first contacts. when the fuse wire suplrej fund ni't is'm place within. the recess in the, first P. unentioned support. and a member arranged the-destruction ofthe fuse wire, the .niember being supported solely by the fuse W e;

to'aiitoxiiatieally move to p'osition'between the contacts of the fusewire support uporfi i 3 In, a cutrout'of the class described, a

' fu s'e wire support including spaced portions insulated from each other, y

a contact carried eacl'ifpor'tion, a support having spaced walls between vwhich thefuse wire support is removably disposed, contactscarried; by :the secondmentioned support and engaged by the contacts upon the spaced portions of thefuse wire support, a fuse wire electrically connected with the the said fuse wire support and extending between thespaced members thereof, and a block of insulating material disposed be tween the walls-of the second mentioned support 1 and between the a spaced, portions, of the fusewire support and resting by gravity upon the fuse wire and supported solely thereby. j l i 4, 'In a cut-out of the class described, a

support of insulating material,-spaced termi-' na ls upon the support the support being, recessed between the terminals, a fuse plug having spaced memberseach carrying a fuse wire terminal, a fuse wire extending be'-' tween the said members of the plug and the terminals upon the members being arranged C, E. STROMQUIST.

said contacts .upon 

